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limbus (n.)

Latin, literally "edge, border" (see limb (n.2)). Used in English in various senses; in Medieval Latin the name of the region on the border of Hell, and thus sometimes used in very correct English for limbo (n.1).

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Definitions of limbus from WordNet

limbus (n.)
a border or edge of any of various body parts distinguished by color or structure;
From wordnet.princeton.edu